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Submit to Islam and be safe. Or agree to the payment of the Jizya (tax), and you and your people will be under our protection, else you will have only yourself to blame for the consequences, for I bring the men who desire death as ardently as you desire life.

This letter was written by Khalid, from his head-quarters in Babylonia, to the Persian monarch Emperor Yazdegerd III before invading it. (History of the World, Volume IV [Book XII. The Mohammedan Ascendency], page 463, by John Clark Ridpath, LL.D. 1910.)

I know more about Khalid than anyone else, no man is luckier than he. No man is his equal in war. No people face Khalid in battle, be they strong or weak, but are defeated. Take my advice and make peace with him.

Prince Ukaid of Domat ul Jandal. (633 A.D)

By Allah, I shall destroy the Romans and the friends of Satan with Khalid bin Al Walid.

Is the standard of this army a black one? Is the commander of this army a tall, powerfully built, broad shouldered man with a large beard and a few pock marks on his face? Then beware of fighting this army.

Byzantine priest. (633 A.D)

He neither slept nor let others sleep, and nothing was concealed from him.

Al-Tabari

Khalid is truly the commander. May Allah have mercy upon Abu Bakr, He was a better judge of men than I have been.

I have not dismissed Khalid because of my anger or because of any dishonesty on his part, but because people glorified him and were misled. I feared that people would rely on him. I want them to know that it is Allah who does all things; and there should be no mischief in the land.